黄骅台陷(沧州段)馆陶组地热水地球化学特征及成因分析

为进一步研究揭示黄骅台陷(沧州段)地区馆陶组地热水地球化学特征及形成机理,研究地下水运移过程中所发生的水岩作用,本文对研究区内地热水全分析水样23件(含同位素8件),综合运用Piper三线图、离子比值法、水岩平衡、矿物饱和指数法等手段进行了综合分析研究。结果表明黄骅台陷(沧州段)馆陶组热水均属于中度变质水,大部分水样水岩作用尚未达到平衡状态,溶滤作用仍在进行中,围岩主要矿物成分中,易溶成分未达到饱和,而难溶成分基本达到了饱和状态;地热水来源为主要为大气降水,补给区距研究区较远,热水循环速率为18 mm/d,径流比较缓慢。研究结果为地热资源的合理开发利用提供了详实依据,同时也为今后该地区的地热地质研究工作提供了参考。

Geochemical characteristics and origin of geothermal water of Guantao formation in Huanghua depression(Cangzhou region)

The 23 total analysis water samples of the geothermal water in the studied area (including 8 pieces of isotopes) were analyzed and researched comprehensively using the Piper three-line diagram, ion ratio method, water-rock balance method, and mineral saturation index method, etc. in order to research and reveal the chemical characteristics and formation mechanism of the hot water in Guantao Group of the Huanghua platform depression area (Cangzhou section) further and to study the water-rock interactions during the migration of groundwater. The results show that the hot water in the Guantao Group of the Huanghua Platform Depression (Cangzhou Section) belongs to moderate metamorphic water. A majority of the water samples have not reached the equilibrium state yet, and leaching still takes effect. Among the main mineral components of the surrounding rock, the easily soluble components have not become saturated while the insoluble components have basically saturated. The geothermal water is mainly sourced from atmospheric precipitation and the replenishment area is far from the studied area. The circulation rate of hot water is 18 mm/d, with a relatively slow runoff. The research results provide a concrete basis for the rational development and utilization of geothermal resources, as well as reference for future geothermal and geological researches in this area.